12d for Hydrographic Survey Drawings Query

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Nigel Meikle
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Joined: Thu Sep 10, 2020 9:42 am

12d for Hydrographic Survey Drawings Query

Post by Nigel Meikle » Fri Nov 13, 2020 5:54 pm

Hi,

I am a new user to 12d and am interested in utilising 12d for the compilation of hydrographic surveying data sets.
We are currently using 12d to present drawings as below however we do not present ‘soundings’ as such, only contours.
Image

I would like to present our data with more in line with hydrographic nautical charting standards using 12d.

I would like to know if 12d is capable of presenting soundings as shown below in metres and decimetres rounded down. Eg 25.98 becomes 25.9.

Sounding Image

Additionally running a ‘clash’ routine to determine the shoalest sounding within a particular region and then present that sounding value without overwriting adjacent soundings.
Image

Lots of places are still using Terramodel and the Hydrographic Data Management System (HDMS) to compile hydrographic drawings. I really feel that if these HDMS features were available in 12d it would be great. If anybody out there knows more about this please provide me with some advise.
Thanks in advance.

Sam Cech
Posts: 3411
Joined: Fri Oct 14, 2005 12:56 pm
Location: Silverdale, NZ
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Re: 12d for Hydrographic Survey Drawings Query

Post by Sam Cech » Fri Nov 13, 2020 7:42 pm

viewtopic.php?t=6564

Few users wrote their own macros for this

There are utf characters you could use
Or two text strings
Cheers
Sam

Tatras Consulting Ltd

Nigel Meikle
Posts: 3
Joined: Thu Sep 10, 2020 9:42 am

Re: 12d for Hydrographic Survey Drawings Query

Post by Nigel Meikle » Sat Nov 14, 2020 10:52 am

Thanks Sam,

When I click the link it says I am not authorised to read this forum???

Sam Cech
Posts: 3411
Joined: Fri Oct 14, 2005 12:56 pm
Location: Silverdale, NZ
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Re: 12d for Hydrographic Survey Drawings Query

Post by Sam Cech » Sat Nov 14, 2020 10:58 am

You need to register with a dongle and once you get your full access should be all good
Cheers
Sam

Tatras Consulting Ltd

Nigel Meikle
Posts: 3
Joined: Thu Sep 10, 2020 9:42 am

Re: 12d for Hydrographic Survey Drawings Query

Post by Nigel Meikle » Sat Nov 14, 2020 3:16 pm

I have registered with a dongle seems strange?

Sam Cech
Posts: 3411
Joined: Fri Oct 14, 2005 12:56 pm
Location: Silverdale, NZ
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Re: 12d for Hydrographic Survey Drawings Query

Post by Sam Cech » Sat Nov 14, 2020 3:18 pm

it can take a little while to get the logon info and forum unlocked
call your local support or email them
Cheers
Sam

Tatras Consulting Ltd

Graeme Winfield
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Re: 12d for Hydrographic Survey Drawings Query

Post by Graeme Winfield » Mon Nov 16, 2020 9:50 am

Nigel Meikle wrote:
Sat Nov 14, 2020 10:52 am
Thanks Sam,

When I click the link it says I am not authorised to read this forum???
Hi Nigel

Try now.

Lee Gregory
12d Support
Posts: 1810
Joined: Thu Sep 29, 2005 6:06 pm

Re: 12d for Hydrographic Survey Drawings Query

Post by Lee Gregory » Thu Nov 19, 2020 4:45 pm

Nigel,
Do you have more information on exactly what you want for the depth soundings?

Lee Gregory
12d Support
Posts: 1810
Joined: Thu Sep 29, 2005 6:06 pm

Re: 12d for Hydrographic Survey Drawings Query

Post by Lee Gregory » Mon Nov 23, 2020 6:03 pm

Nigel,
Looking the your example of a sounding value, how do you know where the sounding actually is ?
I see a little dot inside the box which I presume is the (x,y) location of the sounding.

But wouldn't that dot vary for every sounding depending on the width of each number in the font, which actual number is it, how may digit before the decimal place, the number after the decimal place ?

Years ago I thought people used a decimal point and the decimal point was the location of the sounding.

Sam Cech
Posts: 3411
Joined: Fri Oct 14, 2005 12:56 pm
Location: Silverdale, NZ
Contact:

Re: 12d for Hydrographic Survey Drawings Query

Post by Sam Cech » Tue Nov 24, 2020 12:53 pm

from my experience some software packages don't exactly follow the rules, and most deliverables describe their methodology and as long as it sort of follows it is generally accepted, decimal point or not
not sure if all port authorities follow similar methods, but
the LINZ spec I have seen is here https://www.linz.govt.nz/system/files_f ... download=1

go to page 77-78

My understanding of the gravity position being the centroid of the extents of world size text label
(that is the sub-fix decimal and the whole integer, including the -ve sign for dry spots)

the spec also talks about the density, contours, features that are fully submerged and those that are dry at times

as you can tell, the precision of these is very coarse compare to typical survey/civil work, they round to the side of the safety factor
better to show a shallower depth than rounding to a deeper and increasing the grounding risk
Cheers
Sam

Tatras Consulting Ltd

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